I was thinking of pacemakers for my V8 and the exhaust shop said that they don't just slot in, you need to cut out a few inches of pipe from before the cats and basically do what taximan has described.

Yeah they will bolt into place (on the head) but thats all . The cat will need to relocated and be flanged onto the back of the extractors, some companies manufacture extractors with cats welded in them all ready, but i wouldent buy theese i would just get the cat relocated, should only be a 30m - 1hour job at the most

$300 for the pacemaker extractors (go on ebay the same guy sells them for $260-280)

$300 for a hi-flow 2 1/2" cat

$300 for a off the shelf 2 1/2" cat back mandrel bend system

The sound from it is FANTSTIC, no drones. I've had heaps of people say how nice its sounds, people at work, freinds, guys down at the tyre joint, even commodoor people.

There is a slight loss of tourque blow 3000rpm but afterwards it go's like a rocket.

Next mod is 3.45 diff gears to help with off the line mumbo.

Oh, and i got the exhaust fitted at a midas outlet and I watched them do it, must say its the most pro job i have ever seen, took the poor guy 4 hours, remove old exhaust, fit extractors, bolt up cat, tack weld cat, take off again, weld it properly all the way around repeat process about 4 times for all the flanges in the system. very pro, very happy with it.

Be carful of people who will try to weld around the pipes when it is fitted to the car up on a hoist, never a good job.

The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.

AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.